Would you prefer me asking what the legacy for England's 2018 bid would be?
The most fatal flaw in the England bid wasn't that the bid could be summed up as saying "We invented football, so give us the World Cup" (which was the same for the 2006 tournament) nor the fact that the last time England hosted a major football tournament there was row upon row of empty seats for games not involving England or Scotland, but how the future of numerous clubs was being mortgaged to facilitate the bid. Forest were expected to move into a new 45,000+ seat stadium even though they haven't come close to filling the 30,000 capacity City Ground in years, Plymouth were expected to expand their stadium from 19,000 to 46,000, Leeds were expected to expand Elland Road from 39,000 to 51,000 - if you want to talk legacy, saddling numerous lower league clubs with white elephants is going to leave one hell of a legacy, just not the one that was expected. You just have to look at some of the drains on resources cluttering Portugal after Euro 2004, or closer to home look at the Reynolds Arena in Darlington, to see what would happen.
There was also comment from the English football press at the time of the bid critical of the choice of Stadium MK as a venue, mainly focusing around it being chosen as The FA sought to clear their conscience of allowing Wimbledon to be moved to Milton Keynes.
Lastly, not only were there accidents during the construction of Wembley, one of which fatal, but the fact is the stadium was completed two years later than scheduled. That's hardly an encouraging sign for a nation bidding to host a World Cup, is it?